I am not sure what we (USA) get out of this but it seems to me like we have been encroaching on Russia's space for a while. Part of the deal we made with Russia when the Germany was reunited was that the USA and Nato would not start moving military bases and military capability up to Russia's borders. I think we have been doing that. Why? Is Russia really a threat to us?
The other thing that I find troubling is that many of our allies (Germany, France) don't seem at all enthusiastic over the sanctions against Russia. Why? I would like to understand the difference in what we (USA) want and Europe does.